Electrochemical Sensing of Zinc Oxide and Peroxide Nanoparticles: Modification with Meso-tetrakis(4-carboxyphenyl) Porphyrin

An electrochemical method was developed to investigate the redox properties of zinc oxide (ZnO), zinc peroxide (ZnO2), and sodium-doped zinc peroxide (Na-ZnO2) nanoparticles. The intention was to distinguish the identity of these nanoparticles among themselves, and from other transition metal oxide nanoparticles (TMONPs). Analysis of 3 mM sodium metabisulfite by cyclic voltammetry (CV) produced anodic/cathodic peak currents that are linearly related to the mass of deposited nanoparticles. A graphite working electrode was essential to the oxidation of metabisulfite. ZnO nanoparticles were crucial to the enhancement of metabisulfite oxidation current, and PPy coating could suppress the current enhancement by covering all nanoparticle surfaces. Furthermore, meso-tetrakis(4-carboxyphenyl) porphyrin was demonstrated to be a good chemical reagent that facilitates the differentiation of ZnO from ZnO2 and nanoparticles by CV analysis.

Automated summary

An electrochemical method was used to study the redox properties of zinc oxide, zinc peroxide, and sodium-doped zinc peroxide nanoparticles. Cyclic voltammetry analysis showed that the peak currents are linearly related to the mass of deposited nanoparticles. ZnO nanoparticles played a crucial role in enhancing the oxidation current of metabisulfite, while PPy coating suppressed the current enhancement by covering all nanoparticle surfaces. Additionally, meso-tetrakis(4-carboxyphenyl) porphyrin was found to be a good chemical reagent for differentiating ZnO from ZnO2 and nanoparticles.